AB Chance Capstan 750 lb Electric Portable Winch Hoist Model 500

AB Chance Capstan 750 lb Electric Portable Winch Hoist Model 500, used dirty capstan hoist winch, electric, plugged it in and it turns on and spins, the wiring is frayed and exposed, and when plugged it arcs like the brushes need replacing, also there is no on/off button.